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MDEV-9652: EXPLAIN FORMAT=JSON should show outer_ref_cond

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Show outer_ref_condition in EXPLAIN FORMAT=JSON output.
This commit is contained in:
Sergei Petrunia
2016-02-28 18:18:29 +03:00
parent 0dbfc0fde7
commit ab44e892d8
5 changed files with 59 additions and 1 deletions
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40
mysql-test/r/explain_json.result
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@ -1543,3 +1543,43 @@ ANALYZE
set optimizer_switch=@tmp_optimizer_switch;
set join_cache_level=@tmp_join_cache_level;
drop table t1,t2,t3,t4;
#
# MDEV-9652: EXPLAIN FORMAT=JSON should show outer_ref_cond
#
create table t0(a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1 (a int, b int);
insert into t1 select a,a from t0;
explain format=json
select a, (select max(a) from t1 where t0.a<5 and t1.b<t0.a) from t0;
EXPLAIN
{
"query_block": {
"select_id": 1,
"table": {
"table_name": "t0",
"access_type": "ALL",
"rows": 10,
"filtered": 100
},
"subqueries": [
{
"expression_cache": {
"state": "uninitialized",
"query_block": {
"select_id": 2,
"outer_ref_condition": "(t0.a < 5)",
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 10,
"filtered": 100,
"attached_condition": "((t0.a < 5) and (t1.b < t0.a))"
}
}
}
}
]
}
}
drop table t0,t1;